CN105373656A - Simulation method for cam shaft speed signal during fast prototype simulation of two-stroke diesel engine - Google Patents
Simulation method for cam shaft speed signal during fast prototype simulation of two-stroke diesel engine Download PDFInfo
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- CN105373656A CN105373656A CN201510742782.0A CN201510742782A CN105373656A CN 105373656 A CN105373656 A CN 105373656A CN 201510742782 A CN201510742782 A CN 201510742782A CN 105373656 A CN105373656 A CN 105373656A
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/36—Circuit design at the analogue level
- G06F30/367—Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods
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Abstract
The invention provides a simulation method for a cam shaft speed signal during fast prototype simulation of a two-stroke diesel engine. The method comprises the following steps: 1) acquiring a crankshaft speed signal of the diesel engine through MicroAutoBox, and creating a cam shaft speed signal simulation model through Simulink; 2) outputting a simulated cam shaft speed signal to a RapidPro System through a hardware channel of DIO of the MicroAutoBox after calculation of the cam shaft speed signal simulation model; and 3) synchronizing the acquired cam shaft speed signal and the simulated cam shaft speed signal through the RapidPro System, and outputting a jet driving current. The method has the following advantages: the cam shaft speed signal can be simulated in a software computing mode on the premise of not adding hardware, and an input source of cam shaft signal simulation is the same as a crankshaft signal to be synchronized by the RapidPro System finally, so that the problem in time reference of signal synchronization on the premise of additionally adding the hardware is solved, the cost of project development is reduced, and the development cycle is shortened.
Description
Technical field
The invention belongs to Diesel Engine Technique Field, the analogy method of camshaft speed signal when especially relating to a kind of two stroke diesel engine rapid prototyping.
Background technology
Increasing along with diesel engine performance, no matter traditional development tool can not meet the demands on construction cycle or cost, must adopt modern development process, namely based on the exploitation of model.Exploitation based on model is a kind of software development methodology, and advantage is: the algorithm that can run and automatic code generating.Based on a link important in the development process of model be exactly rapid control prototyping emulation.
In prior art, the analogue system generally applied is all design for the Development of ECU for Compressed of four-cycle diesel, Otto cycle engine has bent axle and camshaft speed signal, enter analogue system after being gathered by sensor, analogue system complete bent axle (crankshaft) and camshaft (camshaft) tach signal synchronous after allow to carry out spraying fire.And two stroke diesel engine only has single axle tach signal, cannot directly provide camshaft signal to rapid control prototyping analogue system.
In sum, be applied in two stroke diesel engine Development of ECU for Compressed for enabling rapid control prototyping analogue system in modern development process, simulation camshaft speed signal is needed to complete synchronous method or device to analogue system, and not a kind of special method that can simulate the camshaft speed signal of analogue system identification or device both at home and abroad at present.
Summary of the invention
In view of this, the analogy method of camshaft speed signal when the present invention is intended to propose a kind of two stroke diesel engine rapid prototyping, to simulate the camshaft speed signal that rapid control prototyping analogue system can identify, analogue system is enable to complete the synchronous and two stroke diesel engine spraying fire of the angle of bent axle and camshaft speed signal.
For achieving the above object, technical scheme of the present invention is achieved in that
The hardware platform of the inventive method uses the diesel engine rapid control prototyping analogue system of dSPACE company, comprises MicroAutoBox and RapidProSystem assembly; MicroAutoBox is the calculating for various controlled quentity controlled variable, also can gather tach signal (do not require bent axle and camshaft synchronous) and output spraying fire waveform (not driving the ability of fuel injector) simultaneously, RapidProSystem is used to the sensor signals such as collecting crankshaft rotating speed, camshaft speed, water temperature, pressure and carries out synchronous or conditioning, carries out the output of jet drive electric current after receiving the control signal of MicroAutoBox computing.Cardinal principle of the present invention utilizes the output principle of spraying fire waveform in MicroAutoBox to realize.
During two stroke diesel engine rapid prototyping of the present invention, the analogy method of camshaft speed signal, comprises the steps:
1) gathered the speed of crankshaft signal of diesel engine by MicroAutoBox, create camshaft speed signal imitation model by Simulink;
Diesel engine speed signal Spe is exported through crankshaft signal module after wherein MicroAutoBox collects speed of crankshaft signal;
The input end of described camshaft speed signal imitation model inputs described diesel engine speed signal Spe, model calculates the value of b by formula [Spe × a/6], c inputs as the injection advance angle of the real-time output module of DIO of MicroAutoBox, and b is inputted as the injection time of the real-time output module of DIO; Wherein a is the crank shaft angle angle value (unit: oCA) of the multiple tooth width of camshaft, b is the time value (unit: s), c is the phase differential (unit: oCA) of bent axle and camshaft of the multiple tooth width of camshaft;
2) after the calculating of camshaft speed signal imitation model, the spraying fire waveform exported by the hardware corridor of the DIO of MicroAutoBox exports to RapidProSystem as the camshaft speed signal of simulation;
3) carry out synchronously, then completing the output of jet drive electric current to the camshaft speed signal of the speed of crankshaft signal collected and simulation by RapidProSystem.
Relative to prior art, the present invention has following advantage:
(1) can under the prerequisite not increasing hardware, the mode adopting software to calculate completes the simulation of camshaft speed signal, and will to carry out synchronous crankshaft signal with final RapidProSystem be a signal source to the input source of camshaft signal simulation, solve the time reference problem of synchronizing signal under extra increase hardware prerequisite; Advanced development system just can be made to be applied in two stroke diesel engine exploitation because hardware cost need not be increased simultaneously, thus decrease the cost of project development and shorten the construction cycle;
(2) the multiple tooth position of the camshaft signal of simulating can be determined according to project demands, namely can complete amendment immediately by software design patterns, meets the demand that different model two-stroke engine controls.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the theory diagram of the analogy method of camshaft speed signal during two stroke diesel engine rapid prototyping described in the embodiment of the present invention;
Fig. 2 is the computing block diagram of the camshaft speed signal imitation model described in the embodiment of the present invention;
Fig. 3 is the Simulink illustraton of model of camshaft speed signal imitation model described in the embodiment of the present invention.
Embodiment
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.
Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
The analogy method of camshaft speed signal during two stroke diesel engine rapid prototyping of the present invention, as shown in Figure 1, wherein hardware platform uses the diesel engine rapid control prototyping analogue system of dSPACE company, comprises MicroAutoBox and RapidProSystem assembly; This method comprises the steps:
Step 1, the speed of crankshaft signal gathering diesel engine by MicroAutoBox, graphically creates camshaft speed signal imitation model by Matlab/Simulink as shown in Figure 3;
Diesel engine speed signal Spe is exported through crankshaft signal module after wherein MicroAutoBox collects speed of crankshaft signal;
As shown in Figure 2, the input end of described camshaft speed signal imitation model inputs described diesel engine speed signal Spe, model calculates the value of b by formula [Spe × a/6], c inputs as the injection advance angle of the real-time output module of DIO of MicroAutoBox, and b is inputted as the injection time of the real-time output module of DIO; Wherein a is the crank shaft angle angle value (unit: oCA) of the multiple tooth width of camshaft, b is the time value (unit: s), c is the phase differential (unit: oCA) of bent axle and camshaft of the multiple tooth width of camshaft.
Step 2, after the calculating of camshaft speed signal imitation model, the spraying fire waveform exported by the hardware corridor of the DIO of MicroAutoBox exports to RapidProSystem as the camshaft speed signal of simulation;
Step 3, carries out synchronously, then completing the output of jet drive electric current to the camshaft speed signal of the speed of crankshaft signal collected and simulation by RapidProSystem.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (1)
1. the analogy method of camshaft speed signal during two stroke diesel engine rapid prototyping, is characterized in that: wherein hardware platform uses the diesel engine rapid control prototyping analogue system of dSPACE company, comprises MicroAutoBox and RapidProSystem assembly; This method comprises the steps:
1) gathered the speed of crankshaft signal of diesel engine by MicroAutoBox, create camshaft speed signal imitation model by Simulink;
Diesel engine speed signal Spe is exported through crankshaft signal module after wherein MicroAutoBox collects speed of crankshaft signal;
The input end of described camshaft speed signal imitation model inputs described diesel engine speed signal Spe, model calculates the value of b by formula [Spe × a/6], c inputs as the injection advance angle of the real-time output module of DIO of MicroAutoBox, and b is inputted as the injection time of the real-time output module of DIO; Wherein a be the crank shaft angle angle value of the multiple tooth width of camshaft, the b time value that is the multiple tooth width of camshaft, the c phase differential that is bent axle and camshaft;
2) after the calculating of camshaft speed signal imitation model, the spraying fire waveform exported by the hardware corridor of the DIO of MicroAutoBox exports to RapidProSystem as the camshaft speed signal of simulation;
3) carry out synchronously, then completing the output of jet drive electric current to the camshaft speed signal of the speed of crankshaft signal collected and simulation by RapidProSystem.
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| CN201510742782.0A CN105373656B (en) | 2015-11-04 | 2015-11-04 | The analogy method of camshaft speed signal during two stroke diesel engine rapid prototyping |
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| CN201510742782.0A CN105373656B (en) | 2015-11-04 | 2015-11-04 | The analogy method of camshaft speed signal during two stroke diesel engine rapid prototyping |
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| CN105373656B CN105373656B (en) | 2018-05-11 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060277010A1 (en) * | 2005-06-03 | 2006-12-07 | Herbert Schutte | Parameterization of a simulation working model |
| CN101871843A (en) * | 2010-05-31 | 2010-10-27 | 浙江大学 | Crankshaft and camshaft analog signal generating method and device thereof |
| CN102540906A (en) * | 2012-02-17 | 2012-07-04 | 浙江大学 | Field programmable gate array (FPGA)-based device and method for generating analog signals of crankshaft and camshaft |
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2015
- 2015-11-04 CN CN201510742782.0A patent/CN105373656B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060277010A1 (en) * | 2005-06-03 | 2006-12-07 | Herbert Schutte | Parameterization of a simulation working model |
| CN101871843A (en) * | 2010-05-31 | 2010-10-27 | 浙江大学 | Crankshaft and camshaft analog signal generating method and device thereof |
| CN102540906A (en) * | 2012-02-17 | 2012-07-04 | 浙江大学 | Field programmable gate array (FPGA)-based device and method for generating analog signals of crankshaft and camshaft |
Non-Patent Citations (3)
| Title |
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| 刘原: "用于燃料电池系统控制的快速控制原型ECU的研发", 《汽车工程》 * |
| 白思春: "发动机控制中同步信号获取方法", 《车用发动机》 * |
| 褚全红: "快速控制原型技术在水平对置二行程柴油机上的应用", 《车用发动机》 * |
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